Which military product design innovation was specifically developed in response to the high casualty rates from shrapnel during World War I?

Throughout history, military product design has revolutionized warfare while introducing innovations that later transformed civilian life. From radar technology to GPS systems, military R&D has shaped our modern world. This trivia question focuses on a pivotal design development that changed battlefield tactics and equipment standards. Test your knowledge about how product design principles have influenced military history!

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The M1 helmet (tin hat), designed to protect against overhead artillery fragments
The Thompson submachine gun, designed for trench clearing operations
The Fokker synchronization gear, allowing machine guns to fire through propellers
The Mark I tank, designed to overcome barbed wire and machine gun positions